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If the thing you're going against is "corporate server controls your data", why is the answer "EC2 proxy we control"? It sounds like I have to trust that server just as much, and essentially you're telling me you're, for some unspecified reason, more trustworthy than Google?

Do you have stats on e-mail deliverability given that you're suggesting I send all my e-mail through a random EC2 EIP? (Is it actually an EIP, or is it just default EC2 egress?)

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Hi lvh - it's not a proxy. The EC2 instance can't see your emails. The Helm server initiates and receives TLS connections through the instance so it's really an extra hop on the internet. We don't see or keep data on deliverability of individual Helm servers. We use a dedicated EIP that we ensure are not on blacklists and configure reverse DNS as well.

If that’s the case, why does it listen on IMAPS/993 and 587?

because it's forwarding packets to/from the Helm server in the home

But that's IMAPS and SMTP submission. Is that for random hosts on the Internet (like my phone on LTE) to read/send e-mail?

Yes - these ports are forwarded so customers can reach the server in their home from anywhere in the world.

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